here is drew griffin. >> reporter: it was just by chance the medical director at the dialysis clinics in georgia was discussing clinic procedures with one of the nurses, danielle barber, and the two saw something they believed was very wrong. medicine, lots of it, was being tossed in the trash. and the clinic workers were being told to do it. >> when we sat down and we started to talk about it, and getting into details we actually realized exactly what is going on. >> reporter: the alleged waste was being carried out on a massive scale, and the nurse and doctors say they knew almost immediately just why. they claim it was a way for their company, davita, to defraud the government, over-bill medicaid and medicare, and make a fortune. >> we're talking about a huge amount of money. >> we're talking about hundreds of millions, easily. of the profits that this company raped from these schemes, from the two drugs, hundreds of millions. >> reporter: and because we're talking about defrauding medicaid and medicare, that is hundreds of millions that you, the taxpayers, pay for. they saw the al